In the notes, tweaked some wordings to reflect that a pubkey may require zero or multiple signatures. This change was originally made on 14-Aug-2013 but never committed.
Added era-files.js to the notes. This was originally written on 14-Aug-2013 but never committed.
Added some really old notes that were written on 7-Feb-2013 but never committed.
In the notes, added "type-erased module format.txt", a precursor(?) to era-file-formats.txt that was written on 11-Apr-2013 but never committed.